Thalasseus maximus
Silhouette: Andy Wilson · PhyloPic
In 3 days ~10% in a week ~30%
The royal tern (Thalasseus maximus) is a tern in the family Laridae. The species is endemic to the Americas, though vagrants have been identified in Europe. The royal tern was described by the French polymath Georges-Louis Leclerc, Comte de Buffon in 1781 in his Histoire Naturelle des Oiseaux from a specimen collected in Cayenne, French Guiana. The bird was also illustrated in a hand-colored plate engraved by François-Nicolas Martinet in the Planches Enluminées D'Histoire Naturelle which was produced under the supervision of Edme-Louis Daubenton to accompany Buffon's text. Neither the plate caption nor Buffon's description included a scientific name but in 1783 the Dutch naturalist Pieter Boddaert coined the binomial name Sterna maxima in his catalogue of the Planches Enluminées. The royal tern is now placed in the genus Thalasseus that was erected by the German zoologist Friedrich Boie in 1822.
The generic name is derived from the Ancient Greek θάλασσα (thálassa) meaning "sea". The specific epithet maximus is Latin for "greatest". The royal tern belongs to the class Aves and the order Charadriiformes. Charadriiformes includes seabirds and shorebirds of small to medium... Wikipedia →
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Havana | 🇨🇺 Cuba | |
| 2 | San Diego | 🇺🇸 United States | |
| 3 | Montevideo | 🇺🇾 Uruguay | |
| 4 | Miami | 🇺🇸 United States | |
| 5 | Panama City | 🇵🇦 Panama | |
| 6 | Tijuana | 🇲🇽 México | |
| 7 | Santo Domingo | 🇩🇴 Dominican Republic | |
| 8 | Los Angeles | 🇺🇸 United States | |
| 9 | Vitória | 🇧🇷 Brazil | |
| 10 | Barranquilla | 🇨🇴 Colombia |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Downtown Aquarium, Denver | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Royal Tern sighting in Vitória on a given day, based on 28 verified sightings from GBIF citizen-science data. It is the 92nd most-seen of the 126 birds we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
November
In that month about 20% of wildlife watchers report a Royal Tern in Vitória on a given day, against under 5% in May–June, August, October and December–March, the lowest months. That is one of Vitória's wettest months, with about 200 mm of rain against 45 mm in July.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Royal Tern sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
9th of 20
Of the 20 cities where we can rate Royal Tern sightings, Vitória ranks 9th at under 5%. The best odds are in Havana (Cuba, about 30%), San Diego (United States, about 20%) and Montevideo (Uruguay, about 20%).
Same genus: Thalasseus
The closest relatives of the Royal Tern that you can see in Vitória (genus Thalasseus, Crested Terns) are Sandwich Tern (about 10%) and Cabot's Tern (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Royal Tern is recorded against all the birds logged in Vitória (28 verified sightings), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
